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  <!-- 2x代表DPR -->
  <img srcset="
    https://picsum.photos/id/38/150,
    https://picsum.photos/id/38/300 2x,
    https://picsum.photos/id/38/600 4x,
    https://picsum.photos/id/38/900 6x,
    https://picsum.photos/id/38/1200 8x,
  " src="" alt="">
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